Typewriting machine



June'23, 1925'.

J. WALDHEIM TYPEWRITING MACHINE Filed Feb. 1,' 1923 3 Sheets-Sheet lAwe/7hr: WM a W Afiamg June 23; '1925.

J. WALDHEIM TYPEWRITING MACHINE Filed Feb. 1, 1923 3 Sheets-Sheer. 2

June 23, 1925. 1,542,975

' J. WALDHEIM TYPEWRITING MACHINE Filed Feb. 1, 1923 3 Sheets-Sheet 5Patented June 23, 1925.

UNITED STATES PATENT OFFICE.

JOHN WALDHEIM, OF ELIZABETH, NEW JERSEY, ASSIGNOR TO UNDERWOOD TYPE-WRITER COMPANY, OF NEW YORK, N. Y., A CORPORATION OF DELAWARE.

TYPEWRITING MACHINE.

Application fl1ed February 1, 1923. Serial No. 616,275.

To all whom it may conoem:

Be it known that I, JOHN WALDHEIM, a citizen of the UnitedStates,-residing in Elizabeth, in the county of Union and State of NewJersey, have invented certa1n n ew and useful Improvements inTypewriting Machines, of which the following is a specification.

The invention relates to sound-deadening hoods or casings fortypewriting machines. The present application is a division of myapplication, Serial No. 485,521, filed. July 18, 1921.

The object of the invention is not only to provide a casing withseparated inner and outer walls forming an air-chamber therebetween fordeadening the sound, but to further accentuate the sound-deadeningcharacter of the casing by the interposition, between the two walls, ofa partitioning wall or sheet of sound-deadening material,'spaced fromone or both of the inner and outer walls, and to so partition the wallstructure by this sound-deadening sheet and other means that the wall ismade up of a series of cellular sections formed by vertically,longitudinally and transversely subdividing it.

Preferably, the sound-deadening partition is spaced from both inner andouter walls of the casing so as to form two interior chambers. Where, asis usual, the casing-walls are of sheeting, the spacing may be effectedby ribs on the opposed faces of the walls, formed by elongatedindentations in the walls; and the inner and outer walls and thepartition may be held together and in place by rivets or pins passedthrough the ribs and. through the partition, against which the ribsbear.

Other features and advantages will hereinafter appear.

In the accompanying drawings,

Figure 1 is a view, in vertical cross-sectional side elevation, throughthe casing, from front to rear; the machine being indicated in dottedlines therein.

Figure 2 is a front view, partly crosssectioned vertically of thebody-part and cover-part; the parts being disassembled.

Figure 3 is a top plan view of the casing and machine therein; thecasing being partly in cross-section, and the cover-part having beenremoved.

The Underwood standard typewriting machine comprises a main frame 10,which may be supported upon a base 11 by supporting feet 12, the framehaving a forward extension 13, in which are positioned banks of keys 14to operate type-bars, not shown, and cause types carried by thetype-bars to print against a platen 15, journaled in the end wall 16 ofa platen-frame 17. The platenframe forms part of a carriage 19 mountedfor letter-feeding movement upon a front rail 20 and a rear rail 21fixed to the main frame. The carriage comprises various forwardly anddownwardly extending operating levers, such as the carriage-releaselever 22, the carriage-return finger-piece 23, and the line-space handle24, the carriage-release lever being guided in its movement by a bracket25 fixed to the carriage-return finger-piece 23.

For deadening the sounds arising in the typing operation, there isprovided a hood or casing having a body-part 30 and a coverpart or cover31 hinged at 32 to the bodypart. The body-part comprises a rear wall 35,side walls 36, and a front wall in the form of two end portions 37.These latter are spaced laterally to provide an opening through whichthe machine may be inserted into the casing, the machine beingpositioned within the casing by abutments 40 fixed to the rear wall 35and contacting with the rear posts of the main frame 10. When themachine is so positioned within the casing, the forward extension 13projects forwardly from and through the front wall of the casing. Forclosing all of the front openings not occupied by the forward extension,there is provided a front plate 41, which is mounted upon the portions37 by means of hooks 42 projecting between said portions and engagingpins or studs 43 fixed to the portions 37, the hooks 42 being fixed tofront slides 39 mounted upon the front plate 41 by means of studs 44which guide the slides 39 in their upward and downward movement. Theslides have finger-pieces 45 whereby they may he raised to release hooks42 from pins 43, or lowered to cause the hooks to engage the pins.

The machine is then enclosed at the rear, sides and front, and, toenclose the machine at the top, there is provided the cover 31 having arear wall 50, a top wall 51 provided with a transparent plate 52 topermit the interior of the casing to be viewed and make the typingoperation visible. The rear and top Walls form a ceiling for thecover-part, while a front wall 53 terminates above the front plate 41,and side walls 58. A space or slot is thus provided between the loweredge of Wall 53 and the upper edge of plate 41, through which thevarious carriage-operatin levers, heretofore mentioned, extend.

To c ose all of the slot not actually occupied by these levers, there isprovided a set of co-operating cushions 54 and 55, each cushioncomprising folds or loops of sound-deadening material, such as plush,felt, or soft leather. The two-ply margins of said loops are clampedbetween bars 56 to form a unit, one of which is mounted on the frontwall 53, so that cushion 54 extends downwardly, and the other of whichis mounted on'front plate 41, so, that cushion 55extends upwardly, thecushions contacting to close the slot. The cover may be raised by meansof a finger-piece 57 and swung about hinge 32 to permit access to themachine.

It will be seen that the front plate 41,

with its attached cushion 55, extends up wardly to about the middle ofthe platen or on a line with the margin-stops of the machine. To permitgreater access to these margin-stops and to the platen-rotating knobs,as well as to other mechanism associated with the carriage, it isdesirable that the front plate terminate some distance below themargin-stops. To maintain the slot in closed position, and still providethe necessary space to allow access to the carriage mechanism, the frontplate is provided with a hinged portion 72, which may be swung aboutahinge 73 and lowered, but which is normally pressed upwardly intoslot-closing position by springs (not shown).

To further deaden the sounds arising in the typing operation, both thebody-part and the cover-part of the casing comprise walls spaced apart,so that sounds which are transmitted by the inner wall must pass throughthe space between the walls before reaching the outer wall, thuseifectively deadening the sounds. For this purpose, both the body-partand the cover-part each comprise two similarmembers, one smaller thanthe other and fitted within the other, the inner member of each partbeing spaced from the outer member. Thus, the bodypart comprises aninner member or inner body-part 80 and an outer member or outerbody-part 81, the inner member comprising an inner rear wall. 83(Figures land 3?,

inner side members 84 (Figures 2 and 3 I and inner front portions 85(Figure 3), the

inner rear wall, side members and' front' portions being preferablyseparate, lates riveted together. Similarly, the outer odypart 81comprises an outer rear wall 86, outer side members 87 and outer front"portions 88, the outer rear wall, side members and front portions beingpreferably riveted together in a manner similar to the inner body-part.The inner bod -part is provided on its upper edges with anges 89 tooverlie the corresponding 'upper edges of the outer body-part, and theouter body-part is provided on its lower edges with flanges 90, uponwhich rest the lower edges of the inner body-part. To assemble thebody-part, therefore, it is only necessary to slide the inner body-partdownwardly into the outer. body-part, until the flanges 89 rest upon theupper edges of the outer body-part, and the lower edges of the innerbody-part rest upon the flanges 90 of the outer body-part. To close theopenings between the inner and outer body-parts at the front, along thefront side edges, one of the body-parts (here shown as the outerbody-part) may be provided with flanges 91 to overlie the side edges ofthe other body-part.

The walls of the inner and outer parts are provided with co-operatingsimilar, op positely-positioned ribs or indentations 92, which projectinwardly from their inner opposite faces, and are arranged in verticalparallelism thereon. These oppositely-disposed ribs act not only tostrengthen the walls, but also, when the wall structure is assembled,the positions of the opposite ribs so coincide that they constitute aseries of transverse vertical partitions, which divide the length of thewall-chamber into a series of closed, independent portions or discretesound-deadening cells having air-chambers that effect a sound-deadeningof the typing operation. Fastening members 93 are passed through thesewalls to hold the walls together and are countersunk in theindentations. There are interposed between the walls sheets 110 whichmay be composed of felt, cardboard, leather, or any other sounddeadening material, the sheets extending substantially parallel with theinner and outer members, as indicated in Figure 3. These sheets are sointerposed between the walls that the ribs or indentations 92 engagethem on opposite sides, effectually closing each end of the sectionsformed between the partitioning ribs. While thev serve to space theopposite walls from each other, and likewise to keep the ribs fromimmediate contact with each other, for the :cell: formed in the wallstructure by the abutment of the oppositely-positioned ribs sj div'idedlongitudinally into-sound-deadolfing air-chambers or pockets. Theyaflord rs'ubstantial obstruct-ion to the transmission of Sound throughthe casing, as well as through the air-space between the walls.

Similarly, the cover-plate 31 comprises an inner member 100 and an outermember 101, these members being similar in shape, but the inner memberbeing somewhat smaller so that it may fit within the outer member and bespaced therefrom. The inner member 100 comprises an inner rear and topwall, or ceiling, 102, and inner side walls 103, while the outercover-part comprises an o'uter rear and top wall, or ceiling, 104, andouter side walls 105 (Figures '1 and 2) Both the inner and the outercoverparts are cut out to provide the necessary opening for thetransparent late 52. The inner cover-part is provide ,-'at its lowerrear edge, with flanges 106, so that, when the inner and outercover-parts are assembled, the inner cover-part need only be insertedupwardly within the outer cover-part, or the outer cover-part moveddownwardly over the inner cover-part until the bottom edges of the outercover-part rest upon the flanges 106. The inner and outer coverparts areprovided with indentations or corrugations107 similar to theindentations 92 of the body-part, and are similarly fastened by bolts orrivets 108 passing through the indentations in the inner and outer wallsof the cover-part and through sheets 111 of sound-deadening material.

It will be apparent from the fore oing description that there has beenprovi ed a sound-deadening casing have definite characteristics ofconstruction and operation, by providing the outer walls with a seriesof oppositely-positioned, parallel ribs extending inwardly toward eachother from the walls inner faces. When the structure is assembled, it ismade up of a series of independent sound-deadening chambered sections ordiscrete cells. The ribs divide the length of the wall structure intosuch sections by providing internal transverse partitions. In addition,each cell is divided longitudinally, into two opposite sections, byseparating sound-deadening means, each section being provided with anair-chamber adjacent its walls. There is provided, therefore, a wall offew parts, and simple construction, composed of discrete cells closed attheir opposlt'e ends and made up of elements having varying degrees ofsound conductivity. It will be obvious that this constitutes a structurehaving a high degree of resistance to the transmission of sound.

Variations may be resorted to within the scope of the invention, andportions of the improvements may be used without others.

Having thus described my invention, I claim:

1. A sound-deadening casing for a typewriting machine comprising hollowwalls, each being formed with a series of. discrete cells closed attheir ends, each cell constituting a so-und-deadenin air chamber.

2. A sound-deadening casing for a typewritlng machine comprising hollowwalls,

each formed with means dividing the wall body into a series of discretecells, each cell being subdivided by a longitudinal parlongitudinalpartition of sound-deadening material.

5. A sound-deadening casing for a typewriting machine comprising ollowwalls, each formed with means integral with the wall body dividingthewall body into a series of discrete cells closed at ther oppositeends, each cell being subdivided by a longitudinal partition ofsound-deadening material separating the walls throughout.

6. A sound-deadening casing for a typewriting machine comprising hollowwalls formed with a series of discrete sound-deadening cells subdividingthe wall body, said cells being closed at their opposite ends andsubdivided by a longitudinal partition of sound-deadening material,forming an air chamber or pocket on each side of the sounddeadeningmaterial.

7. A sound-deadening casing for a typewriting machine comprising hollowwalls, each formed with means integral with the wall body dividing thewall body into a 105 series of discrete cells closed at their oppositeends, each cell being subdivided by a longitudinal partition ofsound-deadening material separating the means dividing the wall bodyinto cells.

8. A sound-deadening casing for a typewriting machine comprising hollowwalls, each formed with means integral with the wall body dividing thewall body into a series of discrete cells closed at their opposite ends,each cell being subdivided by a longitudinal partition ofsound-deadening fibrous material separating the walls.

9. A sound-deadening casing for a typewriting machine comprising hollowwalls, each formed with means integral with the wall body opposite andprojecting inwardly from the inner faces thereof dividing the wall bodyinto a seriesof discrete cells closed at their opposite ends, each cellbeing sub- 125 divided by a longitudinal partition of sounddeadeningmaterial separating the walls.

10. A sound-deadening casing for a typewriting machine, said casingcomprising inner and outer walls of sheet-material, a

sheet of sound-deadening material set between the inner and outer Walls,spacmg .elements formed by indentations in the inner and outer Walls, incontact with the interior partition, whereby the inner and outer wallsand the partition form two chambers, sald indentations beingsubstantially parallel and opposed to one another and formed unitarywith the inner. and outer walls, and means passing through theindentations and through the interior partition to hold the wallstogether.

11.. A sound-deadening casing for a typewriting machine comprisinghollow walls, each formed with means integral with the wall bodyopposite and projecting inwardly from the inner faces thereof dividingthe wall body into a series of discrete cells closed at their oppositeends, each cell being subdivided bya longitudinal partition ofsounddeadening material separating the walls and the oppositeWall-partitioning means.

12. A sound-deadening casing for a typewriting machine comprising hollowwalls, each formed with means integral with the wall body dividing thewall body into a series of discrete cells closed at their opposite ends,each cell being subdivided by a longitudinal partition ofsound-deadening material separating the walls and the means dividing theWall body into cells.

13. A sound-deadening casing for a typewriting machine comprising innerand outer walls separated from each other and a partition ofsound-deadening material spaced from the walls by a series of opposedribs of substantially uniform cross-section integral with the wallsprojecting from the inner sides thereof, the sound-deadening materialbeing between the opposed ribs, and means to Hold said walls andsound-deadening material in assembled relation.

14. A sound-deadening casing for a typewriting machine comprising abody-part and a cover-part, each having walls composed of threesubstantially parallel members, two outer members and an intermediatemember of fibrous sound-deadening material longitudinally partitioningsaid outer members from one another, the outer members having opposedribs integral therewith and projeeting inwardly therefrom separated bythe intermediate member, and means to fasten the outer members andintermediate member in fixed relation, so that the wall structurecomprises a series of discrete cells having air chambers.

15. A sound-deadening casing for a typewriting machine, comprising innerand outer walls of sheet-material, ribs formed .in the opposed faces ofthe two walls by elongated indentations thereof, and a partition betweenthe two walls against which the ribs bear to form two chambers, the ribsin the inner and outer walls bein unitary therewith, substantiallyparalle and opposed one to the other.

16. A sound-deadening casing for a typewriting machine, comprising innerand outer walls of sheet-material, ribs formed in the opposed faces ofthe two walls b elongated indentations thereof, a partition tween thetwo walls against whlch the ribs bear to form two chambers, the ribs inthe inner and outer walls being unitary therewith, substantiallyparallel and opposed one to the other, and means passing through theribs and through the partition to hold the walls together.

17. A sound-deadening casing for a typewriting machine comprising abody-part and a cover-part, each havin walls composed of a plurality ofsubstantlally parallel members, outer members and an intermediate memberof fibrous sound-deadening material longitudinally partitioning saidouter members from one another, the outer members having opposed ribsintegral therewith and projecting inwardly therefrom separated by theintermediate member, and means to fasten the outer members andintermediate member in fixed relation and thereby subdivide the wallstructure into a series of s'ub- I stantially similar discrete cellshaving air chambers formed by longitudinal and transverse partitions.

18. A sound-deadening casing for a typewriting machine comprising abody-part and a cover-part, each having walls composed of a plurality ofsubstantially parallel plates,-

two outer plates and an intermediate partitioning plate of fibroussound-deadening material, the outer plates having a series of opposedribs of substantially uniform crosssection formed integral therewith,similarly projecting from the inner sides thereof inwardly, saidpartitioning plate bein set between the opposed ribs in the outerplates, and means fastening the plates together in fixe'd relation sothat the wall structure comprises a series of discrete cellularformations having air chambers.

JOHN WALDHEIM. Witnesses:

EDITH B. LIBBEY, JENNIE P. THORNE.

